Apparatus for coating



Feb. 15, 1938. PAUL 2,108,389

APPARATUS FOR COATING Filed Dec. 15, 1955 3 Sheets-Sheei i 6 26 z Z2 24I J0 Z, Z bwenior:

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Feb, 15, 1938. PAUL APPARATUS FOR COATING Filed Dec, 15, 1955 3Sheets-Sheet 2 [Wei J02: J Lew/v J PGUL',

Feb. 15, 1938. l. J. PAUL 2,108,389

APPARATUS FOR COATING Patented Feb. 15, 1938 PAT OFFICE APPARATUS FORCOATWG Irvin J. Paul, Gary, Ind., assignor to American Sheet and TinPlate Company, a corporation of New Jersey Application December 13,1935, Serial No. 54,305

ll Claim.

This invention relates to an apparatus for coating and more particularlyone which is adapted to the coating of highly finished metallic sheetsor strips, although not limited thereto.

According to the teachings of the prior art, most coating apparatusadapted to the treatment of highly-finished metallic sheets, or strip,is concerned with the deposition thereon of oil and the like, in orderto prevent corrosion of the finished product. These apparatus thereforeare adapted to apply coating medium to material which is characterizedby having open surfaces which readily retain-the medium. That is to say,the surface of the material, although extremely l5 smooth, is somewhatporous.

Accordingly, for material of this type the use of conventional rubber,cloth, or felt rolls and/or associated wiper plates has been verysatisfactory, despite the fact that the various indenta- 0 tions anddepressions of the rolls and wiper plates caused the work-piece tobecome streaky with excess coating medium. This streaky condition wasnot very objectionable.

In recent years there has been a great demand for highly-finishedmetallic sheets or strip obtained by severe hot and/or cold reduction togage by rolling. The surface of this material is extremely smooth andhas what might be termed closed pores. The surface condition of materialof this type is such as to cause the coating medium to congeal andsegregate thereon. If the material is merely to be coated in order ,toprevent corrosion this condition is not important, but modern processingmethods require it to be closely compacted and annealed in furnaces atrelatively high temperatures. Underthese conditions a coating which isnot uniform causes the highly-finished surfaces to adhere. That is tosay, in the case of sheets they are superimposed and thus. caused toadhere; while on the other hand the various convolutions of a coil willstick in the .same manner.

It is one of the objects of the present invention to provide a novelapparatus for coating which 4.5 distributes the coating medium over theworkpiece in an extremely uniform manner, and one which has in the pastbeen impossible to attain.

The coating thus obtained enables highly-finished metallic sheets, orstrip material, to be either stacked, or coiled, and subjected toextremely high temperatures for annealing, or other heat treatment,without adherence.

Another object is the provision of a novel ap- Paratus of the classdescribed which enables a constant and uniform coating of sheet materialin a rapid manner, and one which is at the same time relatively cheapand easy to install and operate.

These and further objects will be apparent after referring to thedrawings, in which:

Figure 1 is a plan of the apparatus of the invention.

Figure 2 is a sectional view on the line II-II of Figure 1.

Figure 3 is a sectional view on the line III-III 10' of Figure 1.

Figure 4 is a fragmentary enlarged detail.

" Referring more particularly to-the drawings, the numeral 2 generallydesignates the frame of the apparatus of the invention. A shaft 3 is 15suitably journaled in the frame 2 and carries a relatively large roll t.A pair of supports 6 is disposed adjacent the frame 2 and carries ashaft 1 which is suitably journaled therein. This shaft I has arelatively large roll 8 mounted thereon. 20 These rolls t and 8 supportan endless conveyer belt Ill.

A shaft I2 is journaled in the frame 2 adjacent the shaft 3 and carriesa roll i3 which is coated with a non-corrodible metal M, such as chro- 5mium, chromium-nickel, etc. The shaft l2 carries a sprocket it which isconnected to a larger sprocket H on the shaft 3 by means of a chain l8.Thus, it will be seen that while the roll 4; is larger than the roll I3their sprockets (l6 and 0 ll) are correspondingly different, whichprovides not only for their rotation in unison but also at substantiallythe same peripheral speed.

A shaft 20 is journaled in the frame 2 above the shaft l2 and carries aplurality of closely 35 assembled cloth disks 2|. Referring to Figure 2,it will be noted that the shaft 20 is provided with an adjustment 22 forenabling the holding of its cloth disks 2| against the roll 13 undersuitable pressure. The shaft 20 is provided with an out- 40 boardextension 24 which carries a sprocket 25 on its outer extremity. Thissprocket 25 is connected to a similar sprocket 26 of a speed reductionunit 21 by means of a chain 28. The

speed reduction unit 21 is driven by an adja- 45 zontal ways 36 andcarries a rotatable shaft 38 on which there is mounted an applicatorroll 4|] which is coated with a non-corrodible metal 4|,

such as chromium, etc. The disposition of the reciprocable frame 31 onthe bed-plate 35 is adjusted and locked by means of a conventionaladjusting-screw mechanism 42.

A pair of transversely extending and relatively spaced guides 44 aremounted on the reciprocable frame 31 for supporting a reciprocable bar45 which carries a stripper-blade 46. This stripperblade 46 is made ofwear-resistant metal (such as phosphor bronze) and is adapted to bearagainst the applicator roll 45 on the rotatable shaft, which is in turnadapted to bear against the closely assembled cloth disks 2| on theshaft 20. A transverse channel 41 is carried on the reciprocable frame31 adjacent the reciprocabie bar 45 and carries an adjusting device 48for adjusting the disposition of the latter, and the stripperblade 46which is carried thereby, with respect to the applicator roll 40.

A tray 50 is mounted on the reciprocable frame 45 immediately below theapplicator roll 46 and is supplied with oil 5|, or other coating medium,through a pipe 52. The level of the coating medium 5| in the tray ismaintained sufficiently high to enable its contact with the lower sideof the applicator roll 40 which applies the same to the closelycompacted cloth disks 2| on the shaft 26.

The rotation of the shaft 33 is eifected in the following manner: Theshaft 3 on which the roll 4 is mounted carries an outboard extension 55to which there is secured an eccentric 56. The

, shaft 38 also carries an outboard extension 51 on which there ismounted a conventional ratchet device 58 having an operating arm 59.This operating arm 59 is connected to the eccentric 56 on the extension55 on the shaft 3 by a connecting-rod 60. Thus, as the shaft 3 isrotated, the

ratchet device 58 will cause the intermittent partial rotation of theapplicator roll 40 which in turn applies the coating medium 5| to theclosely compacted cloth disks 2| on the shaft 2|].

The material to be coated (X in Figure 1) will be evenly coated on itsupper surface as it passes between the cloth disks 2| and the roll I3with which it is in contact.

The coating medium 5| will be transferred from the cloth disks 2| to theroll l3 after one work-piece being treated passes through the apparatus.If the work-pieces are in the form of relatively small sheetstheapplication of the coating medium 5| to the roll I3 is an importantfactor, as it enables the even coating of the workpiece on both sides.In the case of continuous strip material, the medium will not besupplied to the roll l3 sufliciently often to be effective. However,this consideration is unimportant for the reason that it is onlynecessary to evenly coat one side of each work-piece, whether it is tobe stored, heat-treated or otherwise processed.

While I have shown and described one specific embodiment of myinvention, it willbe understood that I do not wish to be limited exactlythereto, since various modifications may be made Without departing fromthe scope of my invention, as defined by the following claim.

I claim:

In an apparatus for coating flat metals a hard and non-corrodible roll,a resilient and absorptive roll, said first and second named rolls beingconstructed and arranged to receive the workpiece therebetween and makecontact with the same, and a hard and non-corrodible roll for makingcontact with said resilient and adsorptive roll and applying a coatingmaterial thereto, said resilient and absorptive roll comprising aplurality of axially aligned fibrous disks.

IRVIN J. PAUL.

